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FROM THE PREFACE: Dramatic adjustments take place within the body structure of such a lot animals in the course of their improvement. one of the vertebrates, birds are totally oviparous, stay for variable classes in a cleidoic egg, and express primary adjustments in excretion, foodstuff, and breathing on the time of hatching. against this, the eutherian mammals are all viviparous, depend upon the maternal movement and a really expert placenta to supply meals, trade gases, and discharge wastes.
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